Ski



y 9, 1941- B. w. svENssoN- 2,250,684

SKI I Filed June 19, 1939 Fiy 4.

. k3 I v H h L I\ Patented July 29, 1941 UNITED STATES PATENT OFFICE SKI Bror Walter Svensson, Ostersund, Sweden Application June 19, 1939, Serial No. 279,790 In Sweden February 22, 1939 2 Claims. (Cl. 52.80-11.13)

This invention relates to improvements in a same circumstances otherwise, which matter of ski with one or more longitudinal guiding grooves fact has been evident by more comparing trials. on its underface, which ski is so designed as to By ru i up l h cess s in usual ases be speedier than those with the ordinary guiding prevents (when the snow is rather tight) pergroove or grooves. fectly the skis I to slide backwards. When the Other objects will in part be obvious and in snow is incompact or soft it is sufficient for prepart be pointed out hereinafter. venting backwards sliding of the skis by running To the attainment of the aforesaid objects the uphill to put a little ski-paste-oil in the one or invention still further resides in those novel deboth of the recesses. v

tails of construction and arrangement of parts, According to a modification of the invention which will be first fully described in the followe all f he recesses 3 in e ski y ing detailed description and then be pointed out ever, be of uniform breadth along its whole in the appended claims. length but may gradually decrease in depth to According to this improvement the invention h b k f t k as S ow at 4, and g d y is mainly distinguished thereby, that two or more m ge as Well into the g oves 2 as int the lidlongitudinal recesses are arranged within the ing surface f t e s iside edges of the ski-sole on the line of the guidaving thus described the invention what I ing groove or grooves and that each recess has Claim is! such a shape that it at the front in relation to A ski having e e o ud na the ski is deeper and of greater width than the d n o ve 011 s e a e gliding sole guiding groove and that it from thi former part, and two or more longitudinal recesses arranged gradually decreases to the back part of the ski Within the side edges of the ski-sole on the line as well in width as in depth and gradually merges f the guiding ove or v e h ec s into the groove of the ski. having such a shape that it at the front in rela- The accompanying drawing represents by Way tion to the ski is deeper and of greater width of an example a form of embodiment of the subthan the guiding oove d that it from th s ject of the invention. Fig. 1 shows the ski from former P is of fo m b adth 0 W d h a o below and Figure 2 the same from the side. Figs. its whole n th but radually dec eases to the 3 and 4 show on a larger scale cross sections of back P f e ski in depth and g d y the ski, taken transverse of the same at places merges as Well into the guiding groove as into just right in front of these Figures 3 and 4. the gliding rface of the ski. Figure 5 is a plan elevational view, showing a 2. A ski havin a ent al l n itudi al guid slight modification of my invention, groove in its lower surface, said ski being pro- The ski I shown on the drawing has, as a vided with aplurality of intervening longitudinal usual running ski, only one guiding groove 2 but depressions along its central groove, said depresmay of course have two or more such grooves sions being at their forward ends formed with a parallel to each other. As will be clearly obvious curved boundary of a width te t a sa d from the drawing the groove at two places has central groove, and with sides tapering towards been made wider and deeper, forming recesses 3, the rear ends thereof and merging at their re- Which gradually decreases to the back part of spective ends with said central groove in size the ski as well in width as in depth and at a and depth, said intervening depressions being place 4 merge in the guiding groove. By rundeeper at their forward ends than the depth of ning and especially by slalom running downhill the central groove, sloping in depth towards the there will arise small air pockets in these rerear ends thereof, substantially as shown and cesses, whereby the friction will be reduced con- 4 described. siderably and the speed therefore will be greater BROR WALTER SVENSSON. than by running with other skis during the 

